Paint and method of making same.



'owrrnn s ra'rns PATENT GFFICE.

SAMUEL S. NELLIGAR, OF WASHINGTON, DISTRICT OF COLUMBIA.

PAINT AND METHOD OF MAKING SAME.

No Drawing.

those lithopone paints, previously on the market.

It has been generally recognized, by workers in this art that lithoponeis a Very good pigment, and especially for flat paint, but this is opento certain objectionable features, especially when used in locationswhere the direct sunshine is allowed to act on the painted surface.Under these conditions, the pigment will, in many instances,

turn dark, rather rapidly, and if the paint is white, it will soon turnto a grayish color, giving a dlrty appearance to the painted surface.Tl11S is highly disadvantageous, as

' it has prevented the extended use. of paints containing lithopone, inall places where the direct sunlight will strike the work, and c011-sequently this has limited the use of lithopone to inside work, and toplaces free from direct sun.

A serious objection, to the use of the paints heretofore employed,containing a considerable amount of turpentine, has been the penetratingand persistent odor of this material. which is objectionable to mostpeople. It has heretofore been proposed to substitute gasolene and othersimilar liquids, in place of all, or a portion of the turpentineemployed in paints, primarily on account of the cheapness of gasolene ascompared with turpentine, but this substitution has not given entiresatisfaction, for the reason that the paints thereby produced are ofinferior quality, particularly as regards the elasticity and durability.The paint, vehicle, which I preferably employ includes turpentine. butincludes materials which greatly modify the odor thereof. I have foundafter careful experiments, that I can overcome these objections by theuse of the following formula: I grind together, lithopone, 124: parts,sublimed lead, or zinc lead, parts,

Specification of Letters Patent.

Patented Oct. 10, 1916.

Application filed August 5, 1914. Serial No. 855,303.

to which I may add zinc oxid, 2 parts, asbestine, 2- parts, starch, 4.parts, silica, (silex) 2 parts. These materials are ground in a varnishfree from ordinary rosin, such as a varnish composed ofturpentine-linseed oil-copal, to which may be added a solution Ofl:parts of parafiin wax dissolved in 12 parts of turpentine. This mixtureis then thinned with a thinning agent, which may be composed of amixture of 32- parts of gum olibanum, 170 parts of turpentine, 430 partsof linseed oil, which will require about 6 gallons (more or less) ofthis thinner to 230 pounds of the paste paint, containing about 200pounds of mixed pigment. These proportions are sufiicient to make athin, ready flowing paint. If more thinner is needed a small amount of amixture of linseed oil and turpentine may be added, or if too thin alittle more of the ground pigment (or paste) may be added. Theproportions above stated will generally be right for a mixed paint. Thelinseed oil, when making white paint should be what is generally termedbleached oil, although for colored paints this is not always necessary.Any desired amount of color may be added to produce paints having thedesired tint. Certain of the ingredients are optional, the paraffinbeing added as a colorpreservative, and to prevent sagging, and thestarch to kill the gloss. A small part of the gum olibanum may bereplaced by gum mastic, say about 10%. Such a paint will be entirelyfree from the objectionable feature of darkening in the sunlight, andwill'have an excellent brightness, and will be flat. I call attention tothe fact that the lead is preferably sublimed lead, (basic lead sulfate)and not white lead (basic lead carbonate) as the latter will notovercome the feature of darkening in sunlight. The grinding of thepigments in the varnish will make the step of thinning much easier thanwould be the case, were oil used. to grind in. and the amount of varnishwill not disturb the flatness, as the gloss of the varnish will bekilled by the thinner.

As above stated, I may use zinc-lead instead of the sublimed lead, andit will be noted that the lead of this is mostly in the give Withlithopone, a paint which will befast to direct sunlight. Any leadpigment, in which the lead is present principally in the form ofsulfate,appears to be suitable.

i hat I claim is:

1. A composition of matter comprising lithopone, a sulfatized leadpigment, varnish, linseed oil, turpentine, and gum olibanum in suchproportions as to produce a paint. a

2. A composition of matter comprising lithopone, sublimed lead, avarnish, starch, paraffin, linseed oil, turpentine, gum olibanum,asbestine and silica, in such proportions as to produce a paint.

3. A paint including lithopone, a sulfatized lead pigment, a varnish,starch, paraffin, linseed oil, turpentine, and gum olibanum, insubstantially the proportions specified.

4t; A process of making a paint Which comprises grinding lithopone and asulfatized lead pigment, in a varnish, adding a vehicle including gumolibanum dissolved in a solvent, said materials being so proportioned asto produce a paint.

In testimony whereof I aifix my signature in presence of two Witnesses.

SAMUEL S. NELLIGAR.

W'i tnesses A. B. Fosrnn, BENNETT S. JoNEs.

Qopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. Q v,

